From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Cross-section drawing of a mechanical valve, possibly for a carburettor, with design annotations.
| Identifier | ExFiles\Box 178\3\ img125 | |
| Date | 1st April 1932 guessed | |
| Vent here if you wish. Alternative vent. Or the vent might be through here. Smooth curved surface. Not to scale: (Shews .6 lift.) No hole for dirt. For economy in height, length of bore & cleanliness, this cap fits on the outside of the boss. 2 or 3 small holes. Connected without restriction to venturi or under throttle. The pot in this design is same size as valve. It cannot lift until the depression gets into the upper chamber. I think the depression should be taken from the venturi or from above the restriction - i.e. just under throttle. The drawing you sent had some good features but I think this is simpler and more robust. | ||